Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 04-01-2021 and time 13:49:48 (Italy) in region 1 km S Serra Sant'Abbondio (PU)

A magnitude ML 0.5 earthquake occured in region: 1 km S Serra Sant'Abbondio (PU), on

  • 04-01-2021 12:49:48 (UTC)
  • 04-01-2021 13:49:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.48, 12.77 at 15 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Serra Sant'Abbondio PU 1 1027 1027
Frontone PU 4 1300 2327
Sassoferrato AN 9 7285 9612
Pergola PU 11 6333 15945
Cantiano PU 11 2245 18190
Scheggia e Pascelupo PG 12 1393 19583
Cagli PU 12 8731 28314
Arcevia AN 14 4612 32926
Costacciaro PG 14 1216 34142
Genga AN 15 1797 35939
Sigillo PG 17 2404 38343
Acqualagna PU 17 4393 42736
Fabriano AN 20 31480 74216
San Lorenzo in Campo PU 20 3414 77630
Fratte Rosa PU 20 966 78596

Municipalities with at least 50000 inhabitants

An earthquake occurred to
45 Km SW of Fano (60888 inhabitants)
49 Km S of Pesaro (94582 inhabitants)
52 Km NE of Perugia (166134 inhabitants)
59 Km N of Foligno (57155 inhabitants)
62 Km W of Ancona (100861 inhabitants)
66 Km S of Rimini (147750 inhabitants)
72 Km E of Arezzo (99543 inhabitants)
84 Km SE of Cesena (96758 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 0.5 2021-01-04
12:49:48		 43.48 12.77 15 2021-01-04
12:58:05		 Sala Sismica INGV-Roma 86013391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-04 12:49:48 ± 0.16
Latitude 43.48 ± 0.01
Longitude 12.77 ± 0.01
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86013391

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 733
Semi-minor axis of confidence ellipse (meter) 442
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 12
Circular confidence region, given by single value of horizontal uncertainty (meter) 730
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.29768
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 86013391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-04 12:58:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CAFI.HHZ. 2021-01-04T12:49:59.66 3.0 undecidable manual P -0.04 0
IV.ATPC.HNZ. 2021-01-04T12:49:57.83 0.3 undecidable manual S 270 0.2266 108 0.29 67
IV.NARO.HHZ. 2021-01-04T12:49:56.50 0.6 undecidable manual S 313 0.188 114 0.04 48
IV.MPAG.EHZ. 2021-01-04T12:49:55.55 0.6 undecidable manual S 357 0.1466 122 0.16 48
IV.PIEI.HHZ. 2021-01-04T12:49:55.85 0.6 undecidable manual S 287 0.1781 115 -0.35 46
IV.ARVD.HHZ. 2021-01-04T12:49:55.35 0.6 undecidable manual S 83 0.1259 128 0.47 46
IV.CRTC.HHZ. 2021-01-04T12:49:54.15 0.1 undecidable manual P 16 0.2977 102 -0.61 81
IV.ATSC.EHZ. 2021-01-04T12:49:54.07 0.6 undecidable manual S 226 0.0836 142 0.07 49
IV.SSFR.HHZ. 2021-01-04T12:49:53.40 0.6 undecidable manual S 169 0.0468 157 -0.05 50
IV.ATPC.HNZ. 2021-01-04T12:49:53.56 0.1 undecidable manual P 270 0.2266 108 -0.03 96
IV.FRON.EHZ. 2021-01-04T12:49:53.27 0.6 undecidable manual S 318 0.0477 157 -0.18 48
IV.ARVD.HHZ. 2021-01-04T12:49:52.25 0.1 undecidable manual P 83 0.1259 128 0.2 96
IV.MPAG.EHZ. 2021-01-04T12:49:52.72 0.1 undecidable manual P 357 0.1466 122 0.38 91
IV.PIEI.HHZ. 2021-01-04T12:49:52.73 0.1 undecidable manual P 287 0.1781 115 -0.08 97
IV.NARO.HHZ. 2021-01-04T12:49:52.95 0.1 undecidable manual P 313 0.188 114 -0.01 98
IV.SSFR.HHZ. 2021-01-04T12:49:51.02 0.1 undecidable manual P 169 0.0468 157 -0.2 96
IV.FRON.EHZ. 2021-01-04T12:49:51.24 0.1 undecidable manual P 318 0.0477 157 0.02 100
IV.ATSC.EHZ. 2021-01-04T12:49:51.46 0.1 undecidable manual P 226 0.0836 142 -0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FRON.EHE. ML:0.7 6.06E-5 0.16 AML other m 2021-01-04T12:49:53.33
IV.FRON.EHN. ML:0.8 7.54E-5 0.7 AML other m 2021-01-04T12:49:53.45
IV.PIEI.HHN. ML:0.5 2.155E-5 1.72 AML other m 2021-01-04T12:49:55.05
IV.PIEI.HHE. ML:0.7 2.88E-5 0.68 AML other m 2021-01-04T12:49:56.18
IV.ARVD.HHE. ML:0.3 1.39234205E-5 0.0576 AML other m 2021-01-04T12:49:55.58
IV.ARVD.HHN. ML:0.3 1.57656355E-5 0.0576 AML other m 2021-01-04T12:49:55.96
IV.MPAG.EHE. ML:0.6 2.955813E-5 0.1216 AML other m 2021-01-04T12:49:55.71
IV.MPAG.EHN. ML:0.3 1.3480279E-5 0.0576 AML other m 2021-01-04T12:49:55.92
IV.NARO.HHE. ML:0.4 1.647627E-5 0.064 AML other m 2021-01-04T12:49:58.13
IV.NARO.HHN. ML:0.2 1.08456375E-5 0.064 AML other m 2021-01-04T12:49:57.14
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download